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Ashish kumar pradhan
Ashish kumar pradhan
Asked: April 24, 20212021-04-24T16:15:58+05:30 2021-04-24T16:15:58+05:30In: Physical Metallurgy & Heat treatment

Why martensite is so hard?

Why martensite is so hard?
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    1. C Patel Metallurgy Platinum GATE Metallurgy Coaching
      2021-05-20T18:25:17+05:30Added an answer on May 20, 2021 at 6:25 pm

      Reason: Martesite contains supersaturated solid solution of C, this makes it hard by solid solution method and Martensite contains lath/plate structure of ferrite which does not allow easy dislocation motion and also it contains many dislocations formed during quenching which makes it hard.

      Reason:

      1. Martesite contains supersaturated solid solution of C, this makes it hard by solid solution method and
      2. Martensite contains lath/plate structure of ferrite which does not allow easy dislocation motion and also it contains many dislocations formed during quenching which makes it hard.
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    2. Anonymous
      2021-04-28T08:55:33+05:30Added an answer on April 28, 2021 at 8:55 am

      Martensite is so hard because in austenite phase was decomposed into martensite when there was rapid cooling and quenching. Due to rapid cooling and quenching the microstructure of austenite becomes more stronger so after rapid cooling martensite becomes so hard other than any phases in IC DIAGRAM

      Martensite is so hard because in austenite phase was decomposed into martensite when there was rapid cooling and quenching. Due to rapid cooling and quenching the microstructure of austenite becomes more stronger so after rapid cooling martensite becomes so hard other than any phases in IC DIAGRAM

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    3. Anonymous
      2021-05-07T15:30:29+05:30Added an answer on May 7, 2021 at 3:30 pm

      Because of it's bct structure?

      Because of it’s bct structure?

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    4. xavi
      2021-07-05T15:48:12+05:30Added an answer on July 5, 2021 at 3:48 pm

      You see the carbon trapped in the octahedral holes cause displacement of Fe atoms along c-axis of BCT in martensite. The tetragonal distortion and volume expansion cause the shear and hydrostatic stresses in lattice, which lock screw as well as edge dislocations and that's the reason behind high harRead more

      You see the carbon trapped in the octahedral holes cause displacement of Fe atoms along c-axis of BCT in martensite. The tetragonal distortion and volume expansion cause the shear and hydrostatic stresses in lattice, which lock screw as well as edge dislocations and that’s the reason behind high hardness of our martensite.

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